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; sprite facing directions
const_def 0, $04
const SPRITE_FACING_DOWN ; $00
const SPRITE_FACING_UP ; $04
const SPRITE_FACING_LEFT ; $08
const SPRITE_FACING_RIGHT ; $0C
const_def 0, $40
const NPC_MOVEMENT_DOWN ; $00
const NPC_MOVEMENT_UP ; $40
const NPC_MOVEMENT_LEFT ; $80
const NPC_MOVEMENT_RIGHT ; $C0
NPC_CHANGE_FACING EQU $E0
; player direction constants
const_def
const PLAYER_DIR_BIT_RIGHT ; 0
const PLAYER_DIR_BIT_LEFT ; 1
const PLAYER_DIR_BIT_DOWN ; 2
const PLAYER_DIR_BIT_UP ; 3
PLAYER_DIR_RIGHT EQU 1 << PLAYER_DIR_BIT_RIGHT
PLAYER_DIR_LEFT EQU 1 << PLAYER_DIR_BIT_LEFT
PLAYER_DIR_DOWN EQU 1 << PLAYER_DIR_BIT_DOWN
PLAYER_DIR_UP EQU 1 << PLAYER_DIR_BIT_UP
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